<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>1_引出生命周期</title>
</head>
<body>
	<!-- 准备好一个“容器” -->
	<div id="test"></div>
	
	<!-- 引入react核心库 -->
	<script type="text/javascript" src="../js/react.development.js"></script>
	<!-- 引入react-dom，用于支持react操作DOM -->
	<script type="text/javascript" src="../js/react-dom.development.js"></script>
	<!-- 引入babel，用于将jsx转为js -->
	<script type="text/javascript" src="../js/babel.min.js"></script>

	<script type="text/babel">
		//创建组件
		//生命周期回调函数 <=> 生命周期钩子函数 <=> 生命周期函数 <=> 生命周期钩子
		class Life extends React.Component{
            state={opacity:1}
            death=()=>{
                // 卸载组件
                ReactDOM.unmountComponentAtNode(document.getElementById("test"))
            }
            // 组件挂载完毕
            componentDidMount(){
                this.timer=setInterval(()=>{
                    let {opacity}=this.state;
                    opacity-=0.1;
                    if(opacity<=0) opacity=1;
                    this.setState({opacity})
                },200)
            }
            // 组件将要卸载
            componentWillUnmount(){
                clearInterval(this.timer)
                
            }
            // 初始化渲染
            render(){
                return(
                    <div>
                        <h2 style={{opacity:this.state.opacity}}>React生命周期函数</h2>
                        <button onClick={this.death}>卸载组件</button>
                    </div>
                )
            }
        }
        // 渲染组件
        ReactDOM.render(<Life/>,document.getElementById("test"))
	</script>
</body>
</html>